Temperature dependence of open-circuit voltage in dye-sensitized solar cells

Usami, Akira; Seki, Shiro; Mita, Yuichi; Kobayashi, Hiromu; Miyashiro, Hajime; Terada, Nobuyuki

doi:10.1016/j.solmat.2008.09.040

Cited by 83 publications

(56 citation statements)

References 10 publications

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“…The enhancement of V oc is usually associated with the negative shift of conduction band edge or the suppression of charge recombination. The value of V oc is determined by the potential difference between the Fermi level of TiO 2 and the chemical potential of the redox species (E red ) in the electrolyte, which can be described as Equation (1), [23] in which g is characteristic constant of TiO 2 tailing states, k B is the Boltzmann constant, T is temperature, e is the elementary charge, and N e is the effective density of states at the TiO 2 conduction band edge.…”

Section: à2mentioning

confidence: 99%

A Desirable Hole‐Conducting Coadsorbent for Highly Efficient Dye‐Sensitized Solar Cells through an Organic Redox Cascade Strategy

Song

Choi

et al. 2011

Chemistry A European J

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Over the past decade, dye-sensitized solar cells (DSSCs) [1] based on nanocrystalline mesoporous metal oxides (typically TiO 2 ) have been intensively studied and developed as a promising, low-cost alternative to conventional silicon photovoltaic devices. The components of such DSSCs are a dye sensitizer, a TiO 2 metal oxide coated on conductive glass, a redox electrolyte couple, and a counter electrode. As illustrated in Scheme 1, the power-conversion efficiency of DSSCs is strongly dependent upon the minimization of charge recombination losses at the TiO 2 /dye/electrolyte interface (pathways 3 and 4).[2] There are two recombination pathways of importance in DSSCs, in which electrons photoinjected into the TiO 2 electrode can recombine with either dye cations or with redox electrolytes. Moreover, such charge recombination leads to losses in both the short-circuit photocurrent (J sc ) and the open-circuit photovoltage (V oc ), resulting in a decrease in overall energy conversion efficiency (h).To reduce the possible charge recombination pathways occurring at the TiO 2 /dye/electrolyte interface, several kinds of additives, such as decylphosophonic acid (DPA), dineohexyl bis(3,3-dimethylbutyl)phosphinic acid (DINHOP), and chenodeoxycholic acid (CDCA) have been introduced to adsorb onto the TiO 2 surface.[3] Among them, for example, cholic acid (CA) derivatives as coadsorbents in DSSCs, based on a Ru-pyridyl complex, [4] courmarin, [5] porphyrin, [6] phthalocyanine, [7] and naphthalocyanine dye, [8] have been investigated well. Deoxycholic acid (DCA) is often used as a coadsorbent to break up organic and Ru-dye aggregates and hence to significantly improve V oc and J sc . [5,9] Moreover, alternative approaches directed toward the minimization of recombination losses have been extensively studied by not only the insertion of a metal oxide blocking layer, [10] but also by energetic cascades for multistep hole conductors (HC), [11] as well as superior molecular sensitizer dyes [12] and the insertion of a barrier layer between the sensitizer dye and the HC.[2] To date, however, the desired redox intermediate mediators between the dye and I À /I 3 À redox electro- Scheme 1. a) Schematic diagram of the ideal charge-transfer processes occurring at a dyed TiO 2 /electrolyte interface including organic HC, and b) one of the charge-transfer processes proposed herein. Pathways: (1) Electron injection from the dye or HC-A excited state into the conduction band of the TiO 2 , (2) dye regeneration by electron transfer from a redox couple, (2*) regeneration of the dye and HC-A by electron transfer from a redox couple, (3,4) charge recombination with dye cation and I 3 À ions. Reaction pathway (5) corresponds to the hole-transfer from the HOMO of the dye cation to the HOMO of the HC-A, and (5*) hole transfer from the HOMO of the HC-A to redox electrolyte.

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Section: à2mentioning

confidence: 99%

A Desirable Hole‐Conducting Coadsorbent for Highly Efficient Dye‐Sensitized Solar Cells through an Organic Redox Cascade Strategy

Song

Choi

et al. 2011

Chemistry A European J

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“…Thus the traps located at the TiO 2 surface would lower the electron lifetime in DSCs and resulting in poor cell performance [8]. For this reason, various methods have been developed to improve the cell performance by minimizing the possible recombination pathways occurring at the TiO2jdyejelectrolyte interface [9e11].…”

Section: Introductionmentioning

confidence: 99%

TiO2 films with rich bulk oxygen vacancies prepared by electrospinning for dye-sensitized solar cells

Gao

Wang

et al. 2012

Journal of Power Sources

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“…Agaropectin is a polysaccharide with smaller molecules and lower molecular weight. Agaropectin is a mixture of sulphated galactosyl which depends on the source from which it is obtained [39][40]. Due to numerous hydroxyl groups in the structure of Agar, it is assumed to be a desirable polymer matrix for forming cross-linking networks with other components in the polymer.…”

Section: Characteristics Of the Electrolytementioning

confidence: 99%

Nile Blue and Nickel Organometallic Dyes Applied in Dye-sensitized Solar Cells

Siami¹,

Sabzi²,

Rasouli³

et al. 2015

Port. Electrochim. Acta

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Solar cells (Gratzel cells) have been highly regarded due to their extremely efficient and low-cost process of converting sun light into electricity. In this work screen printed electrodes were fabricated by spraying organic and organometallic dyes on glass and flexible aluminum foil. These solar cells were prepared based on three dyes, namely nickel Di thiocyanato bis(triphenyl phosphine), nickel Dimethylglyoxime and Nile blue, and the performance of these dye-sensitized solar cells (DSSC) has been experimentally evaluated. The solar cells were fabricated using thin TiO 2 films; these films were characterized by FTIR. The dyes were characterized using UV-Vis and typical J-V and P-V curves of the cells. The best performance was obtained for the mixture of nickel Dithiocyanatobis (triphenyl phosphine) and Nile blue with an open circuit voltage (Voc) of 976 mV using an incident irradiation of 100 mW cm -2 at 25 ºC.

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Temperature dependence of open-circuit voltage in dye-sensitized solar cells

Cited by 83 publications

References 10 publications

A Desirable Hole‐Conducting Coadsorbent for Highly Efficient Dye‐Sensitized Solar Cells through an Organic Redox Cascade Strategy

A Desirable Hole‐Conducting Coadsorbent for Highly Efficient Dye‐Sensitized Solar Cells through an Organic Redox Cascade Strategy

TiO2 films with rich bulk oxygen vacancies prepared by electrospinning for dye-sensitized solar cells

Nile Blue and Nickel Organometallic Dyes Applied in Dye-sensitized Solar Cells

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